package com.jopek.submittodatiinator;

import android.annotation.SuppressLint;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.OpenableColumns;
import android.util.Log;

import java.io.DataOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Random;

public class Requests {
    public static final String TAG = "REQUESTS";

    static final String uploadServerUri = "https://jopek.eu/maks/submitto-dati-inator/upload.php";
    private final static String lineEnd = "\r\n";
    private final static String twoHyphens = "--";

    public static ReturnValues uploadFile(Context context, Uri sourceFileUri) {
        final String boundary = "------------------------" + getRandomString(16);
        int serverResponseCode = 0;
        HttpURLConnection conn = null;
        DataOutputStream dos = null;
        int bytesRead, bytesAvailable, bufferSize;
        byte[] buffer;
        int maxBufferSize = 1 * 1024 * 1024;
        String filename = getFileName(context, sourceFileUri);
//        File sourceFile = new File(sourceFileUri);

//        if (!sourceFile.isFile()) {
//            Log.e(TAG, "Source File not exist :" + sourceFileUri);
//            return ReturnValues.NO_FILE;
//        } else {
            try {
                // open a URL connection to the Servlet
//                InputStream fileInputStream = new FileInputStream(sourceFile);
                InputStream fileInputStream = context.getContentResolver().openInputStream(sourceFileUri);

                URL url = new URL(uploadServerUri);

                // Open a HTTP  connection to  the URL
                conn = (HttpURLConnection) url.openConnection();
                conn.setDoInput(true); // Allow Inputs
                conn.setDoOutput(true); // Allow Outputs
                conn.setUseCaches(false); // Don't use a Cached Copy
                conn.setChunkedStreamingMode(2048);
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Connection", "Keep-Alive");
                conn.setRequestProperty("ENCTYPE", "multipart/form-data");
                conn.setRequestProperty("Authorization", "Basic maks:<pass>");
                conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

                dos = new DataOutputStream(conn.getOutputStream());

                dos.writeBytes(twoHyphens + boundary + lineEnd);
                dos.writeBytes("Content-Disposition: form-data; name=" + filename + ";filename=" + filename + "" + lineEnd);
                dos.writeBytes(lineEnd);

                // create a buffer of  maximum size
                bytesAvailable = fileInputStream.available();

                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                buffer = new byte[bufferSize];

                // read file and write it into form...
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);

                while (bytesRead > 0) {
                    dos.write(buffer, 0, bufferSize);
                    bytesAvailable = fileInputStream.available();
                    bufferSize = Math.min(bytesAvailable, maxBufferSize);
                    bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                }

                // send multipart form data necessary after file data...
                dos.writeBytes(lineEnd);
                dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

                // Responses from the server (code and message)
                serverResponseCode = conn.getResponseCode();
                String serverResponseMessage = conn.getResponseMessage();

                Log.i(TAG, "HTTP Response is : " + serverResponseMessage + ": " + serverResponseCode);

                //close the streams
                fileInputStream.close();
                dos.flush();
                dos.close();
                if (serverResponseCode != 200) return ReturnValues.SERVER_ERROR;
            } catch (MalformedURLException e) {
                e.printStackTrace();
                Log.e(TAG, "error: " + e.getMessage(), e);
                return ReturnValues.MALFORMED_URL;
            } catch (Exception e) {
                e.printStackTrace();
                Log.e(TAG, "Exception : " + e.getMessage(), e);
                return ReturnValues.SERVER_ERROR;
            }
            return ReturnValues.OK;
//        }
    }

    public static String getRandomString(int length) {
        int leftLimit = 48; // numeral '0'
        int rightLimit = 122; // letter 'z'
        Random random = new Random();

        return random.ints(leftLimit, rightLimit + 1).filter(i -> (i <= 57 || i >= 65) && (i <= 90 || i >= 97)).limit(length).collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append).toString();
    }

    @SuppressLint("Range")
    public static String getFileName(Context context, Uri uri) {
        String result = null;
        if (uri.getScheme().equals("content")) {
            Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
            try {
                if (cursor != null && cursor.moveToFirst()) {
                    result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
                }
            } finally {
                cursor.close();
            }
        }
        if (result == null) {
            result = uri.getPath();
            int cut = result.lastIndexOf('/');
            if (cut != -1) {
                result = result.substring(cut + 1);
            }
        }
        try {
            return URLEncoder.encode(result, String.valueOf(StandardCharsets.UTF_8));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }

    public enum ReturnValues {
        OK, NO_FILE, MALFORMED_URL, SERVER_ERROR,
    }
}